Method of making seamless stemmed metal plates



S. MYERSON.

MTHOD OF MAKING SEAMLESS STEMMED METAL PLATES. APPLICATION FILED DEC 17. 19:8.

1,308,25 1 Patented July 1, 1919.

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METHOD OF MAKING SEAMLESS STEMMED METAL PLATES.

Specification of Letters Patent.

Patented July 1, 1919.

Application filed December 17, 1918. Serial No. 267,173.

To all whom it may concern:

Be it known that I, SIMON MYERSON, a citizen of the United States, residing at Cambridge, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Methods of Making Seamless Stemmed Metal Plates, of

which the following is a specification.

This invention relates to the manufacture of stemmed metal plates, and particularly stemmed plates adapted for use as the backings of artificial teeth. A tooth backing of the class to which my invention is applicable consists of a thin metal plate formed to be applied to an artificial tooth and provided with a stem formed as a tenon adapted to enter a socket in the tooth.

The invention has for its object to enable a stemmed plate, Without seams or soldered or riveted joints, to be economically and satisfactorily manufactured.

The invention consists in the improved method hereinafter described and claimed.

0f the accompanying drawings forming a part of this specification,

Figure 1 is an end view of a plate or blank used in making a stemmed plate in accordance with my invention.

Figs. 2, 3, and 4: are perspective views showing the plate provided with a bead constituting a blank from which the completed stem is formed.

Fig. 5 is a perspective View showing the bead converted into a stem constituting a tooth-engaging tenon.

Fig. 6 is an edge view of the stemmed plate shown by Fig. 5.

Fig. 7 is a view showing means for forming the bead.

Fig. 8 is a view showing means for converting the bead.

Fig. 9 is a View showing alternative beadconverting means.

The same reference characters indicate the same parts in all of the figures.

In carrying out my invention I provide a flat-sided plate or blank 12 of any suitable ductile vmetal, and having parallel sides. When the blank is to be converted into a tooth backing, it may be made of gold or other relatively precious metal. The thickness of the blank is greater than that of the plate to be produced.

I then subject the blank to pressure in such manner as to reduce its thickness and displace some of its metal toward the longitudinal center and thus form a plate 12* of thedesired thickness, and a bead 13 projecting from the plate and formed from the displaced metal, the bead being integral with the plate. The pressure may be applied by pressure rolls 1 1 and15, .(Fi"g. 7),i one having a groove or recess 16 shaped to.

form the rib. The rib may be shorter than the plate, asshown by FigsJ2 and 3, or it may extend the entire length .of the plate, as shown by Fig. 4, the last-mentioned length being preferred. I next convert the rib into an operative stem, which, as here shown, constitutes a tooth-engaging tenon including a body portion "17, a neck. portion 18, connecting the body portion with the plate, and a reduced end portion 19 projecting from one end of the body portion and overhanging a portion of the plate.

Any suitable converting means maybe employed, such as pressing devices embodied in a pair of pressing or swaging dies 20 and 21, (Fig. 8), or a.pair of grooved pressure rolls. 22 and 23, (Fig. 9), adapted to shape the portions 17 and 18, the reduced end portion 19 being formed either by said pres sure devices, or by a subsequent operation. When the portions 17 and 19 are inclined relatively to the plate, as shown by Figs. 5 and 6', the bead 13 may be similarly inclined, as shown by Fig. 3, although this inclination of the rib is not essential, since the pressing devices may be formed to'impart:

the desired inclination.

As above stated, the rib 13 preferably extends the entire length of the plate, as shown by Fig. 4, one end portion of the rib being subsequently removed.

It is obvious that a blank of sufficient size to form a plurality of plates may be provided with a plurality ,of beads and then cut into separate plates each having a bead, the beads being converted either before or after the cutting operation.

A strip or plate of indeterminate length suitable for a plurality of operative backings may be provided with a rib extending from end to end of the plate, by pressing instrumentalities such as those shown by Fig. 7 therib being then converted by pressing instrumentalities such as those shown by Fig. 8, or by Fig. 9, the rib-forming and ribconverting instrumentalities being arranged in tandem order, so that a series or gang of connected backings may be formed, these being subsequently separated by transversely cutting the strip into lengths each constituting a complete backing.

I claim:

1. The method of making a' seamless" stemmed metal plate, which consists in first forming a relatively thick metal blank, then displacing some of the metal of the blank to form a plate of the desired thickness and a projecting bead integral with the plate, and finally converting said bead into an operative stem.

2. The method of making a seamless stemmed metal plate, which consists in first forming a relatively thick metal blank, then reducing the thickness of portions of the blank to form a plate of the desired thickness and a projecting bead integral with the plate, and finally converting said bead into an operative stem.

3. The method of making a seamless stemmed metal plate, which consists in first forming a relativel thick metal blank vthen displacing some 0 the metal of the blank toward the longitudinal center thereof, thus J forming a plate of the desired thickness and a projecting bead integral with the plate, and finally converting said bead into an operative ste 4. The method of making a seamless stemmed metal plate, which consists in first forming a relatively thick metal blank, then displacing some of the metal of the blank to form a plate of the desired thickness and a projecting bead integral with the plate, and finally converting said bead into a stem constituting a tooth-engaging tenon including a body portion, a neck connecting the body portion with the plate, and a reduced end portion projecting from one end of the body portion and overhanging a poition of the plate.

5. The method of making a seamless stemmed metal plate, which consists in first forming a relatively thick metal blank, then displacing some of the metal of the blank to form a plate of the desired thickness and a projecting bead integral with the plate, and then pressing a part of said rib to form the body portion and neck of a tooth-engaging tenon, and reducing one end of the rib to form a reduced end portion, said body portion, reduced ortion, and neck, constituting a tooth-engagmg tenon.

In testimony whereof I have aflixed my signature.

SIMON MYERSON. 

